Interface between Core and MeshDecoder:

(1) the call to MeshDecoder::decodeMesh
has to be changed to fit the common interface for decoders:

Decoder::Decode(
  unsigned char * pucInput, 
  int iInputLength,
  unsigned char * pucOutput,
  int & riOutputLength)

(2) the input buffer to the decoder 
has to be passed in the correct way (pucInput)

(3) the result of the decoding of 1 frame 
has to be copied to the output buffer (pucOutput)
within Decoder::Decode

